Scientists use lasers to monitor changes in Hawaiis tropical forests

January 24th, 2009 - 12:20 pm ICT by ANI  

Washington, Jan 24 (ANI): In a new research, scientists are quantifying landscape-scale changes occurring to Hawaiis Big Island tropical forests using lasers deployed on airplanes.

The research would observe changes to the tropical forests from non-native plants and other environmental factors that affect carbon sequestration.

The scientists involved in the research, from the U.S. Forest Service and Carnegie Institution, hope it will help other researchers racing to assess threats to tropical forests around the world.

Our results clearly show the interactive role that climate and invasive species play on carbon stocks in tropical forests, and this may prove useful in projecting future changes in carbon sequestration in Hawaii and beyond, said Gregory Asner, with the Carnegie Institutions Department of Global Ecology.

According to the scientists, airborne technology might be the best way to quickly examine rugged ecosystems covered with dense vegetation that make them difficult to study on the ground or with satellites.

These findings showed airborne data correlated with data derived from study plots on the ground, said Flint Hughes, a Forest Service ecologist at the agencys Institute of Pacific Islands Forestry and one of the studys authors.

They also demonstrated what might be the most important environmental factors affecting forest biomass and carbon sequestration, he added.

Hughes and his colleagues compared field measurements with data derived from the Carnegie Airborne Observatory, a system that uses a combination of lasers capable of measuring elevation to within six inches, GPS and advanced imaging spectrometers that can identify plant species from aircraft.

The scientists placed the equipment on an airplane that flew over the northeast flank of the Mauna Kea Volcano and the Hawaii Experimental Tropical Forest.

They then compared the information to field observations that included tree diameter, canopy height and wood density estimates.

Their findings not only demonstrated the effectiveness of airborne observations, but also offered a landscape-scale view of how alien invasive plants like strawberry guava might affect biomass levels in the context of carbon sequestration and climate change mitigation.

Study results suggest fast-growing invaders decrease biomass levels, while slower-growing species increase biomass stocks. (ANI)

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